I have a Galaxy S2 Skyrocket (i727) with CyanogenMod9 on it. I got the HDMI adapter from amazon, plugged in the power to it, plugged in the HDMI and then into the phone. It worked fine! The screen rotated and all was well. Then I pulled it out, and I cannot get it to work again. The monitor seems to be getting a signal (when not plugged in, I get a No Signal warning), but the screen is black. Any ideas? I bought a second adapter but I am having the same problem with that one, so I think it's the phone.